linux/fs/xfs/xfs_inum.h
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   1/*
   2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
   3 * All Rights Reserved.
   4 *
   5 * This program is free software; you can redistribute it and/or
   6 * modify it under the terms of the GNU General Public License as
   7 * published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope that it would be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 * GNU General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write the Free Software Foundation,
  16 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17 */
  18#ifndef __XFS_INUM_H__
  19#define __XFS_INUM_H__
  20
  21/*
  22 * Inode number format:
  23 * low inopblog bits - offset in block
  24 * next agblklog bits - block number in ag
  25 * next agno_log bits - ag number
  26 * high agno_log-agblklog-inopblog bits - 0
  27 */
  28
  29struct xfs_mount;
  30
  31#define XFS_INO_MASK(k)                 (__uint32_t)((1ULL << (k)) - 1)
  32#define XFS_INO_OFFSET_BITS(mp)         (mp)->m_sb.sb_inopblog
  33#define XFS_INO_AGBNO_BITS(mp)          (mp)->m_sb.sb_agblklog
  34#define XFS_INO_AGINO_BITS(mp)          (mp)->m_agino_log
  35#define XFS_INO_AGNO_BITS(mp)           (mp)->m_agno_log
  36#define XFS_INO_BITS(mp)                \
  37        XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp)
  38#define XFS_INO_TO_AGNO(mp,i)           \
  39        ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp)))
  40#define XFS_INO_TO_AGINO(mp,i)          \
  41        ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp)))
  42#define XFS_INO_TO_AGBNO(mp,i)          \
  43        (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \
  44                XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp)))
  45#define XFS_INO_TO_OFFSET(mp,i)         \
  46        ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
  47#define XFS_INO_TO_FSB(mp,i)            \
  48        XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i))
  49#define XFS_AGINO_TO_INO(mp,a,i)        \
  50        (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i))
  51#define XFS_AGINO_TO_AGBNO(mp,i)        ((i) >> XFS_INO_OFFSET_BITS(mp))
  52#define XFS_AGINO_TO_OFFSET(mp,i)       \
  53        ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
  54#define XFS_OFFBNO_TO_AGINO(mp,b,o)     \
  55        ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o)))
  56
  57#if XFS_BIG_INUMS
  58#define XFS_MAXINUMBER          ((xfs_ino_t)((1ULL << 56) - 1ULL))
  59#else
  60#define XFS_MAXINUMBER          ((xfs_ino_t)((1ULL << 32) - 1ULL))
  61#endif
  62#define XFS_MAXINUMBER_32       ((xfs_ino_t)((1ULL << 32) - 1ULL))
  63
  64#endif  /* __XFS_INUM_H__ */
  65
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